[Linux-cluster] A few GFS newbie questions: journals, etc
Lon Hohberger
lhh at redhat.com
Tue Jun 28 22:51:13 UTC 2005
On Tue, 2005-06-28 at 10:08 -0500, Nate Carlson wrote:
> On Mon, 27 Jun 2005, Patrick Caulfield wrote:
> > Yes, you can force expected_votes to be an unreasonable low value.
> > Personally I set it to 1 on my single-machine Xen test cluster but then
> > I don't care about data corruption ;-)
>
> One thing I've noticed with this - it seems that as machines join the
> cluster, expected_votes is automatically raised. (IE, I can start a single
> node and have it gain quorum, but if I join another node and then leave
> the cluster, the first one loses quorum - if I manually drop the expected
> vots with cman_tool, then it gains quorum again.) Is that expected
> behavior? I'd expect manually specifying expected_votes to lock it down.
It's expected behavior.
The quorum calculation algorithm is specifically designed to prevent
what you're doing. The expected_votes is counted at startup, but grows
dynamically after that. The only time where it doesn't grow is in the
"two_node=1" case.
-- Lon
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